The most terrifying part of Makima's power is that she can sacrifice other people! I reckon she has sacrificed her own humanity a long time ago. Now she's capable of killing another person remotely delegating the life for a life exchange to be carried by people who aren't even willing, they just need to utter a name. Now it makes much more sense why Himeno was so pissed off guys keep falling for Makima. Himeno must have known Makima is a monster worse than most devils out there.
Normally I'd be exceedingly annoyed by that, but as it happens, Denji has been established as a dumbass, so it actually suits his character and is consistent. It's like he suddenly got this great idea in the middle of a fight, except that great idea was an idiotic idea serving no purpose in reality, but he wouldn't realise it.
Looking at Kobeni's performance, I can't help but think Makima knew, and that's why Kobeni was allowed to join in the first place. That being said, why didn't Makima bother to arrange any training for Denji? Like that hostage skit. Someone should have told him to never try such a thing when dealing with villains.
I still don't know what the enemies were all about. I maintain my stance in saying that merely being a part of Gun Devil's gang, cult, or whatever, wouldn't allow them to organise all this. They must have an insider. Funnily enough they executed all the goons, and allowed the two to escape, so they haven't got anyone to interrogate. At least they will know who they were and can put the police to look for clues and connections.